I fill my fresh water tank about half full before I leave home, and add to it when I stop overnight at CGs, as needed. But I only use it on the outside of me. For anything that goes inside, like cooking, coffee, drinking or (in my case) soaking my teeth overnight, I buy gallon jugs of distilled water and keep a couple under the sink. Its cheap and available in grocery stores and Wally World everywhere. I've found that local water in CGs often has a "funny" taste. Perfectly safe, but if it flows through iron pipes, I can taste it, and nobody is allowed to mess with my coffee. :)